"Tim" <tim_lis(NOSPAM)@clear.net.nz> wrote in message
news:4589ff03@clear.net.nz...
> air leak in the manifold would be my guess. Remove the manifold and fit a
> new gasket and also check the carb seals/gaskets whilst at it as its easy
> to replace them while the carbs are off.
One quick method to check if the inlet manifold is leaking is to spray WD40,
or equivalent water repellant spray, around the manifold while the engine is
running. It doesn't burn so the engine revs will drop if it is entrained
into the fuel mixture.
GrahamL
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